Aleksey Kladov [Fri, 25 Jun 2021 07:32:13 +0000 (10:32 +0300)]
internal: add cloning macro fixture
Macro that deep clone the tokens but otherwise preserves source
locations and hygiene info is an interesting case for IDE support. Lets
have this, although we don't actively use it at the moment.
bors[bot] [Wed, 23 Jun 2021 22:33:05 +0000 (22:33 +0000)]
Merge #9380
9380: feat: Implement goto_declaration support r=matklad a=Veykril
This is just a simple implementation that falls back to `goto_definition` for everything but modules where it goes to the actual module declaration if possible.
bors[bot] [Wed, 23 Jun 2021 21:33:30 +0000 (21:33 +0000)]
Merge #9353
9353: Include extra targets when the pkg_root is not the same as the target root. r=matklad a=rezural
Fixes #7715
For example, if a sub-crate includes sets the path='../somewhere-else/lib.rs', the files will not be in pkg_root , but in the target root's parent.
It may actually be in root.parent().parent(), I'm not sure about that.
At the moment it is just a fix, are there any relevant tests that this could go in? I've got about 1 brain cell left... but im happy to add tests where appropriate.
bors[bot] [Tue, 22 Jun 2021 22:28:43 +0000 (22:28 +0000)]
Merge #9383
9383: internal: Rewrite token tree lowering to use an explicit stack r=jonas-schievink a=jonas-schievink
Part of https://github.com/rust-analyzer/rust-analyzer/issues/9358, this fixes the first cause of the stack overflow there. Unfortunately we now run into a stack overflow in the parser.
bors r+
Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>
Aleksey Kladov [Tue, 22 Jun 2021 18:22:36 +0000 (21:22 +0300)]
internal: remove one more accidentally quadratic code-path
Definition::visibility was implemented in a rather roundabout way -- by
asking the parent module about the effective visibility.
This is problematic for a couple of reasons:
* first, it doesn't work for local items
* second, asking module about visibility of a child is a linear
operation (that's a problem in itself, tracked in #9378)
Instead, lets ask the declared visibility directly, we have all the code
for it, and need only to actually us it.
Aleksey Kladov [Mon, 21 Jun 2021 17:14:38 +0000 (20:14 +0300)]
feature: massively improve performance for large files
This story begins in #8384, where we added a smart test for our syntax
highting, which run the algorithm on synthetic files of varying length
in order to guesstimate if the complexity is O(N^2) or O(N)-ish.
The test turned out to be pretty effective, and flagged #9031 as a
change that makes syntax highlighting accidentally quadratic. There was
much rejoicing, for the time being.
Then, lnicola asked an ominous question[1]: "Are we sure that the time
is linear right now?"
Of course it turned out that our sophisticated non-linearity detector
*was* broken, and that our syntax highlighting *was* quadratic.
Investigating that, many brave hearts dug deeper and deeper into the
guts of rust-analyzer, only to get lost in a maze of traits delegating
to traits delegating to macros.
Eventually, matklad managed to peel off all layers of abstraction one by
one, until almost nothing was left. In fact, the issue was discovered in
the very foundation of the rust-analyzer -- in the syntax trees.
Worse, it was not a new problem, but rather a well-know, well-understood
and event (almost) well-fixed (!) performance bug.
The problem lies within `SyntaxNodePtr` type -- a light-weight "address"
of a node in a syntax tree [3]. Such pointers are used by rust-analyzer all
other the place to record relationships between IR nodes and the
original syntax.
Internally, the pointer to a syntax node is represented by node's range.
To "dereference" the pointer, you traverse the syntax tree from the
root, looking for the node with the right range. The inner loop of this
search is finding a node's child whose range contains the specified
range. This inner loop was implemented by naive linear search over all
the children. For wide trees, dereferencing a single `SyntaxNodePtr` was
linear. The problem with wide trees though is that they contain a lot of
nodes! And dereferencing pointers to all the nodes is quadratic in the
size of the file!
The solution to this problem is to speed up the children search --
rather than doing a linear lookup, we can use binary search to locate
the child with the desired interval.
Doing this optimization was one of the motivations (or rather, side
effects) of #6857. That's why `rowan` grew the useful
`child_or_token_at_range` method which does exactly this binary search.
But looks like we've never actually switch to this method? Oups.
Lesson learned: do not leave broken windows in the fundamental infra.
Otherwise, you'll have to repeatedly re-investigate the issue, by
digging from the top of the Everest down to the foundation!
bors[bot] [Mon, 21 Jun 2021 13:41:27 +0000 (13:41 +0000)]
Merge #9227
9227: Add a config setting to disable the 'test' cfg in specified crates r=matklad a=lf-
If you are opening libcore from rust-lang/rust as opposed to e.g.
goto definition from some other crate which would use the sysroot
instance of libcore, a `#![cfg(not(test))]` would previously have made
all the code excluded from the module tree, breaking the editor
experience.
Core does not need to ever be edited with `#[cfg(test)]` enabled,
as the tests are in another crate.
This PR puts in a slight hack that checks for the crate name "core" and
turns off `#[cfg(test)]` for that crate.
bors[bot] [Sun, 20 Jun 2021 17:38:27 +0000 (17:38 +0000)]
Merge #9346
9346: Refactor / clean up hir_ty tests r=flodiebold a=flodiebold
Notable changes:
- unify `check_types` and `check_mismatches` into `check`, which supports both kinds of annotations (`check_types` still exists because I didn't want to change all the annotations, but uses the same implementation)
- because of that, `check_types` now fails on any type mismatches; also annotations always have to hit the exact range
- there's also `check_no_mismatches` for when we explicitly just want to check that there are no type mismatches without giving any annotations (`check` will fail without annotations)
- test annotations can now be overlapping (they point to the nearest line that has actual code in that range):
```
// ^^^^ annotation
// ^^^^^^^^^ another annotation
```
projects / rust.git / log